Preparation method of aluminum oxide-silicon dioxide composite ceramic membrane

A composite ceramic membrane and silicon dioxide technology, which is applied in the field of preparation of alumina-silica composite ceramic membranes, can solve the problems of unstable performance of composite ceramic membranes, difficult to control, harsh process parameters for composite sol preparation, etc. The effect of morphology and properties, short film forming cycle and low production cost

Active Publication Date: 2021-01-01
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a preparation method of alumina-silicon dioxide composite ceramic membrane to solve the problems in the prior art that the preparation process parameters of the composite sol are relatively harsh, difficult to control, and the performance of the composite ceramic membrane is unstable.

Method used

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  • Preparation method of aluminum oxide-silicon dioxide composite ceramic membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 1.202g of aluminum trichloride powder and pour it into a beaker, measure 90ml of ammonia water with a concentration of 1mol / L into the beaker, place it in a water bath at 80°C for hydrolysis and stir, then add 1.0g of PVA to the beaker, Add 2 ml of hydrochloric acid dropwise to the beaker to adjust the pH value, control the pH value of the reaction solution to 3, continue stirring in the water bath for 1.5 hours to obtain the aluminum sol.

[0037]Measure 2ml of tetraethyl orthosilicate and pour it into a beaker, measure 90ml of absolute ethanol into the beaker, stir rapidly while adding dropwise, and add 2ml of dilute nitric acid to adjust the pH to 3. Then, 2ml of 1mol / L ammonia water was added dropwise into the beaker, and stirred in a constant temperature water bath at 80°C for 2.5 hours to obtain the desired silica sol.

[0038] At room temperature, mix aluminum sol and silica sol according to the molar ratio of aluminum to silicon of 4:1, add 3ml of nitric a...

Embodiment 2

[0041] At room temperature, mix aluminum sol and silica sol at a ratio of 1:4 (the same molar ratio of aluminum to silicon), add 3ml of nitric acid, heat and stir in a constant temperature water bath, and obtain a composite sol after aging. Others are the same as implementation example 1. The ceramic membrane thus prepared has a thickness of 3.43 μm, a pore size of 1.7 nm, a porosity of 28.4%, and a permeation flux of 3.73 mL cm -2 min -1 .

Embodiment 3

[0043] At room temperature, mix aluminum sol and silica sol at a ratio of 3:1 (the same molar ratio of aluminum to silicon), add 3ml of nitric acid, heat and stir in a constant temperature water bath, and obtain a composite sol after aging. Others are the same as implementation example 1. The ceramic membrane thus prepared has a thickness of 3.32 μm, a pore size of 1.6 nm, a porosity of 26.6%, and a permeation flux of 3.52 mL cm -2 min -1 .

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Abstract

The invention relates to a preparation method of an aluminum oxide and silicon dioxide composite ceramic membrane, which comprises the following steps: (1) weighing aluminum trichloride, pouring intoa container, dropwisely adding ammonia water, stirring and hydrolyzing in a water bath kettle, continuing to add a sintering aid, regulating the pH value to 34, and continuing to stir in the water bath kettle to obtain aluminum sol; (2) weighing tetraethyl orthosilicate, pouring tetraethyl orthosilicate into another container, dropwise adding absolute ethyl alcohol, then adding dilute nitric acidto adjust the pH value to 3-4, then dropwise adding ammonia water, and stirring in a constant-temperature water bath kettle to obtain silica sol; (3) mixing the obtained aluminum sol with silica sol,adding nitric acid, heating, stirring and aging to obtain composite sol; and (4) soaking the support body in the composite sol, taking out the support body, standing the sol on the surface to form xerogel, and carrying out sintering heat treatment on the obtained xerogel to obtain the target product Al2O3-SiO2 composite ceramic membrane. Compared with the prior art, the preparation method disclosed by the invention is simple to operate, low in manufacturing cost and easy to industrialize, and the prepared composite membrane is good in filtering performance.

Description

technical field [0001] The invention belongs to the technical field of composite ceramic membrane preparation, and relates to a preparation method of an alumina-silicon dioxide composite ceramic membrane. Background technique [0002] Ceramic membrane is a member of the inorganic membrane family and belongs to the solid membrane material in membrane separation technology. Ceramic membranes use inorganic non-metallic raw materials, such as alumina, silica, titania, and zirconia, which are processed through molding and sintering processes to obtain functional materials with porous and asymmetric structures. Due to the characteristics of high strength, corrosion resistance, and easy cleaning, inorganic ceramic membranes are widely used in fields such as textiles, industrial wastewater treatment, electronics, chemical industry, petroleum, metallurgy, biopharmaceuticals, and food. [0003] Alumina porous ceramics are generally made of Al 2 o 3 As a matrix, additives are added ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/14C04B35/624
CPCC04B35/10C04B35/14C04B35/624C04B35/62218C04B2235/444C04B2235/483C04B2235/96C04B2235/95
Inventor 江国健陈晗雪
Owner SHANGHAI INST OF TECH
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